This slide provides a refresher regarding the parameters of opamps. As is true of every electronic part, it has to be supplied; it consumes something (power). The opamp has inputs which current flows into and has an output which has limited capability and speed. Beginning with the supply voltage, the slide shows a list and short explanation of the key performance indicators that are important to customers when selecting the appropriate opamp. Another feature is the gain bandwidth, which is the product of the speed in the frequency range that an opamp can operate, multiplied by the gain or the amplification. Whether or not the device can work in a rail-to-rail input as well as output is another feature. The term rail-to-rail means that the level of the inputs can be the full range of the positive and negative supply rails. It also applies to the outputs which are able to extend to both rails, therefore getting the most out of the parts. Another important parameter has to do with the accuracy of the part, which is determined by the input offset voltage or Vio. This also relates to the precision of the part as it determines the output error, which should be as small as possible, as any input offset affects the accuracy at the output.